Standard No.:	GB/T 17215.211-2021
English Name:	Electricity metering equipment(AC)—General requirements, tests and test conditions—Part 11：Metering equipment
Chinese Name:	电测量设备（交流） 通用要求、试验和试验条件 第11部分：测量设备
Chinese Classification:	N22    Electric energy measurement and load control system
Professional Classification:	GB    National Standard
ICS Classification:	17.220.20 17.220.20    Measurement of electrical and magnetic quantities 17.220.20
Issued by:	SAMR, SAC
Issued on:	2021-04-30
Implemented on:	2021-11-1
Status:	valid
Superseding:	GB/T 17215.211-2006 GB/T 17215.211-2006
Language:	English
File Format:	PDF
Word Count:	49500 words
Price(USD):	960.0
Delivery:	via email in 1 business day

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. GB/T 17215.2 consists of the following parts under the general title Electricity metering equipment (AC)—General requirements, tests and test conditions: ——Part 11: Metering equipment; ——Part 21: Tariff and load control equipment; ——Part 31: Product safety requirements and tests. This is Part 11 of GB/T 17215.2. This part is developed in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 17215.211-2006 Electricity metering equipment (a.c.)—General requirements, tests and test conditions—Part 11: Metering equipment. See Annex A for technical changes which have been made with respect to GB/T 17215.211-2006: Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this standard shall not be held responsible for identifying any or all such patent rights. This part was proposed by China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee on Electrical Measuring Instruments of Standardization Administration of China (SAC/TC 104). The previous editions of this part are as follows: ——GB/T 17215-1998, GB/T17215-2002; ——GB/T 17215.211-2006.   Introduction This part is to be used with relevant parts of the following electricity metering equipment series standards: ——GB/T 17215.311 Electricity metering equipment (AC)—Particular requirements—Part 11: Electromechanical meters for active energy (classes 0.5, 1 and 2); ——GB/T 17215.321 Electricity metering equipment (AC)—Particular requirements—Part 21: Static meters for active energy (classes A, B, C, D and E); ——GB/T 17215.323 Electricity metering equipment (a.c.)—Particular requirements—Part 23: Static meters for reactive energy (classes 2 and 3); ——GB/T 17215.324 Electricity metering equipment (a.c.)—Particular requirements—Part 24: Static meters for reactive energy at fundamental frequency (classes 0.5S, 1S and 1); ——GB/T 17215.352 Electricity metering equipment (AC)—Particular requirements—Part 52: Symbols; ——GB/T 17215.421 Electricity metering equipment (a.c.)—Tariff and load control—Part 21: Particular requirements for time switches; ——GB/T 17215.811 Electricity metering equipment (AC)—Acceptance inspection—Part 11: General acceptance inspection methods; ——GB/T 17215.821 Electricity metering equipment (AC)—Acceptance inspection—Part 21: Particular requirements for electromechanical meters for active energy (classes 0.5, 1 and 2); ——GB/T 17215.831 Electricity metering equipment (AC)—Acceptance inspection—Part 31: Particular requirements for static meters for active energy (classes 0.2S, 0.5S, 1 and 2); ——GB/T 17215.911 Electricity metering equipment—Dependability—Part 11: General concepts; ——GB/T 17215.921 Electricity metering equipment—Dependability—Part 21: Collection of meter dependability data from the field; ——GB/T 17215.9311 Electricity metering equipment—Dependability—Part 311: Accelerated reliability testing—Elevated temperature and humidity; ——GB/T 17215.9321 Electricity metering equipment—Dependability—Part 321: Durability testing of the stability of metrological characteristics by applying elevated temperature; ——GB/T 17215.941 Electricity metering equipment—Dependability—Part 41: Reliability prediction; ——IEC 62052-21 Electricity metering equipment (a.c.)—General requirements, tests and test conditions—Part 21: Tariff and load control equipment; ——IEC 62052-31 Electricity metering equipment (AC)—General requirements, tests and test Conditions—Part 31: Product safety requirements and tests; ——IEC 62055-31 Electricity metering—Payment systems—Part 31: Particular requirements—Static payment meters for active energy (classes 1 and 2). This part is intended to be used in conjunction with the appropriate part of IEC 62053 for the type of equipment under consideration. This part is the standard on type test of electricity meters, which together with IEC 62052-31 specifies the general requirements, tests and test conditions applicable to electricity measuring equipment. This part does not involve special functional elements or measurement functions (such as data interface enclosed in the same meter case or power quality measurement function, etc.). This part gives the test levels which are regarded as minimum values for the proper functioning of the meter under normal operating conditions. For special application, other test levels may be used and are subject to an agreement between the manufacturer and the purchaser. Electricity metering equipment (AC)—General requirements, tests and test conditions— Part 11: Metering equipment 1 Scope This part of GB/T 17215.2 specifies the general mechanical and electrical requirements and test conditions, function and identification requirements, weather and electromagnetic environment requirements and test conditions, immunity test to external influences and test conditions and embedded software requirements applicable to type tests of AC electricity meters (hereinafter referred to as "meters"). Note 1: For other general requirements of instruments (e.g. safety, dependability, etc.), see the relevant parts of GB/T 17215.3 (all parts) and GB/T 17215.9 (all parts). For accuracy requirements and other requirements specific to class indices, see the GB/T 17215.3 (all parts). This part is applicable to newly manufactured electricity metering equipment for measuring and controlling electrical energy in 50Hz or 60Hz power grid with voltage up to 600V. All special functional elements except electrical energy measurement function can be integrated in the meter case or formed into a separate case. Note 2: The voltage mentioned above is the line-to-neutral voltage derived from nominal voltages. See IEC 62052-31: 2015, Table 7. If the meter has functions other than measuring active and reactive energy, such as: ——measurement of voltage amplitude, current amplitude, power, frequency, power factor (or sin φ), etc.; ——measurement of power quality parameters; ——measurement of other forms of energy such as water, gas, steam, heat, etc.; ——load control function; ——data communication interface. If it is enclosed in the case, relevant standards can be applied to these functional requirements, but the requirements for these functions are outside the scope of this part. Note 3: Requirements for power measurement devices and measurement functions (e.g. voltage amplitude, current amplitude, power, frequency, etc.) are covered in GB/T 18216.12. However, equipment that complies with GB/T 18216.12 are not intended to be used as billing meter unless it also complies with the relevant provisions of this part and GB/T 17215.3 (all parts). Note 4: Requirements for Power Quality Instruments are covered in IEC 62586-1, and test methods for power quality measurement functions are covered in GB/T 17626.30. Requirements for testing of the power quality measurement functions are covered in IEC 62586-2. The requirements of this part apply if the meter is designed to be mounted on a specified mating (meter) socket or rack, and the meter is installed on the specified mating (meter) socket or rack when the test is carried out. However, the requirements for the specified mating (meter) socket or rack are outside the scope of this part. Note 5: The examples of rack meters are: guide rail-mounted meters, panel-mounted meters, etc. The requirements of this part apply if the meter is designed to install a separation indication display. If each phase of the meter has multiple current circuits, the requirements of this part apply to all current circuits of any current measuring element in the case. This part is also applicable to auxiliary input and output circuits, operation indicators, and test outputs of equipment for electrical energy measurement. Note 6: Some examples include pulse inputs and outputs, control inputs and outputs, and energy test outputs. This part also covers the common aspects of accuracy testing such as reference conditions and repeatability. This part classifies: ——electromechanical meter and static meter; ——single-phase meter and multiphase meter; ——directly connected meter and transformer operated meter; ——meter with internally integrated indicator displays and meter with separate indicator displays; ——indoor meter and outdoor meter.   This part is not applicable to: ——meter with line-to-neutral voltages derived from nominal voltages exceeding 600V; ——laboratory and mobile meter test equipment; ——data interfaces to the register of the meter; ——reference standard meter; ——metering systems comprising multiple devices physically remote from one another; ——portable meters; ——meters used in rolling stock, vehicles, ships and airplanes; ——meters for access via electronic transformers (in accordance with GB/T 20840.8) and low power current transformers (in accordance with IEC 61869-10). Note 7: Portable meters are meters that are not permanently connected. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 2423.1 Environmental testing for electric and electronic products—Part 2: Test methods—Tests A: Cold GB/T 2423.2 Environmental testing for electric and electronic products—Part 2: Test methods—Test B: Dry heat GB/T 2423.4 Environmental testing for electric and electronic products—Part 2: Test method—Test Db: Damp heat, cyclic (12h+12h cycle) GB/T 2423.5 Environmental testing—Part 2: Test methods—Test Ea and guidance: Shock GB/T 2423.43 Environmental testing for electric and electronic products—Part 2: Test methods—Mounting of specimens for vibration impact and similar dynamic tests GB/T 2423.56 Environmental testing—Part 2: Test methods—Test Fh: Vibration, broadband random and guidance GB 4208 Degrees of protection provided by enclosure (IP code) GB/T 17210.3 (all parts) Electricity metering equipment (a.c.)—Particular requirements GB/T 17215.9321 Electricity metering equipment—Dependability—Part 321: Durability testing of the stability of metrological characteristics by applying elevated temperature GB/T 17626.2 Electromagnetic compatibility—Testing and measurement techniques—Electrostatic discharge immunity test GB/T 17626.3 Electromagnetic compatibility—Testing and measurement techniques—Radiated radio-frequency electromagnetic field immunity test GB/T 17626.4 Electromagnetic compatibility—Testing and measurement techniques—Electrical fast transient/burst immunity test GB/T 17626.5 Electromagnetic compatibility—Testing and measurement techniques—Surge immunity test GB/T 17626.6 Electromagnetic compatibility—Testing and measurement techniques—Immunity to conducted disturbances, induced by radio-frequency fields GB/T 17626.12 Electromagnetic compatibility—Testing and measurement techniques—Ring wave immunity test GB/T 17626.18 Electromagnetic compatibility—Testing and measurement techniques—Damped oscillatory magnetic field immunity test GB/T 17626.20 Electromagnetic compatibility—Testing and measurement techniques—Emission and immunity testing in transverse electromagnetic (TEM) waveguide GB/T 17626.29 Electromagnetic compatibility—Testing and measurement techniques—Voltage dips, short interruptions and voltage variations on d.c. input power port immunity tests IEC 61000-4-8: 2009 Electromagnetic compatibility (EMC)—Part 4-8: Testing and measurement techniques—Power frequency magnetic field immunity test IEC 61000-4-11 Electromagnetic compatibility (EMC)—Part 4-11: Testing and measurement techniques—Voltage dips, short interruptions and voltage variations immunity tests for equipment with input current up to 16A per phase IEC 610004-19: 2014 Electromagnetic compatibility (EMC)—Part 4-19: Testing and measurement techniques—Test for immunity to conducted, differential mode disturbances and signalling in the frequency range 2 kHz to 150 kHz at a.c. power ports IEC 6205231: 2015 Electricity metering equipment (AC)—General requirements, tests and test conditions—Part 31: Product safety requirements and tests IEC CISPR 32 Electromagnetic compatibility of multimedia equipment—Emission requirements ISO 4892-3 Plastics—Methods of exposure to laboratory light sources—Part 3: Fluorescent UV lamps 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 General definitions 3.1.1 electromechanical meter meter in which currents in fixed coils react with the currents induced in the conducting moving element, generally (a) disk(s), which causes their movement proportional to the energy to be measured 3.1.2 static meter meter in which currents and voltages act on solid state (electronic) elements to produce an output proportional to the energy to be measured 3.1.3 (active) energy meter watt-hour meter instrument intended to measure active energy by integrating active power with respect to time Note: It is modified from GB/T 2900.79-2008, Definition 313-06-01. 3.1.4 reactive energy meter var-hour meter instrument intended to measure reactive energy by integrating reactive power with respect to time Note: It is modified from GB/T 2900.79-2008, Definition 313-06-02. 3.1.5 multi-energy meter meter which, in a single case, measures two or more types of electrical energy (watt-hour, var-hour, VA-hour) 3.1.6 multi-function meter meter which, in a single case, incorporates other functions in addition to the energy measurement functions Note: Multi-function meters may include: maximum demand indicator, time switches, ripple control or radio receivers, pulse output devices, power monitoring functions, power quality functions, input-output control functions, communication function, etc. 3.1.7 multi-rate meter energy meter provided with multiple registers, each becoming operative as defined by a tariff schedule Note 1: A tariff schedule could be held in the meter, operated on a time basis or a consumption basis, or by external control signals. Note 2: It is modified from GB/T 2900.79-2008, Definition 313-06-09. 3.1.8 interval meter instrument that displays and stores measurement results within a predetermined time interval [OIML R 46-1/-2: Edition 2012 (E), Definition 2.1.2] 3.1.9 directly connected meter meter intended to be connected directly to the circuit(s) being measured without use of external instrument transformer(s) 3.1.10 transformer operated meter meter intended to be connected to the circuit(s) being measured with the use of external instrument transformer(s) 3.1.11 bidirectional meter meter measuring energy flow in both directions Note: For instance, energy received at the measuring point (for example import) and energy supplied at the same measuring point (for example, export). 3.1.12 reference standard (meter) meter used to measure the unit of electrical energy, designed and operated to obtain the highest accuracy and stability in a controlled laboratory environment and traceable to national or international primary standards 3.1.13 meter type specific meter design manufactured by one manufacturer For electromechanical meter, each type has: a) similar metrological properties; b) the same uniform construction of parts determining these properties; c) the same ratio of the maximum current to the nominal current; d) the same number of ampere-turns for the current winding at nominal current and the same number of turns per volt for the voltage winding at nominal voltage. Note 1: The same type may have several values of nominal current and nominal voltage. Note 2: The ratio of the highest to the lowest basic speed of the rotors of each of the meters of the same type shall not exceed 1.5. Note 3: Meters are designated by the manufacturer by one or more groups of letters or numbers, or a combination of letters and numbers. Each type has one designation only. Note 4: The type is represented by the sample meter(s) intended for the type tests, in which characteristics (nominal current and nominal voltage) are chosen from the values given in the tables proposed by the manufacturer. Note 5: Where the number of ampere-turns would lead to a number of turns other than a whole number, the product of the number of turns of the windings by the value of the nominal current may differ from that of the sample meter(s) representative of the type. It is advisable to choose the next number immediately above or below in order to have whole numbers of turns. For this reason only, the number of turns per volt of the voltage windings may differ, but by no more than 20 % from that of the sample meters representative of the type. For static meter, each type has: a) similar metrological properties; b) the same uniform construction of parts determining these properties. Note 6: The same type may have several values of nominal current and nominal voltage. Note 7: Meters are designated by the manufacturer by one or more groups of letters or numbers, or a combination of letters and numbers. Each type has one designation only. Note 8: The type is represented by the sample meter(s) intended for the type tests, in which characteristics (nominal current and nominal voltage) are chosen from the values given in the tables proposed by the manufacturer. 3.1.14 active power P active power at any single sinusoidal frequency component of a periodic signal in a single-phase circuit is defined as the product of the RMS values of current and voltage and the cosine of the phase angle between them, where the phase angle is the angle of the voltage signal vector with respect to the current signal vector Note 1: Under sinusoidal conditions, the active power is the real part of the complex power. Note 2: The active power of a non-sinusoidal periodic signal is the algebraic sum of the active power of the sinusoidal frequency components. Note 3: The coherent SI unit for active power is the watt, W. [GB/T 2900.74-2008, Definition 131-11-42] 3.1.15 active energy time integral of the active power as defined in 3.1.14 Note: The coherent SI unit of active energy is joule, J. Another unit is watt hour. 3.1.16 reactive power (var) reactive power at any single sinusoidal frequency component of a periodic signal in a single-phase circuit is defined as the product of the RMS values of current and voltage and the sine of the phase angle between them, where the phase angle is the angle of the voltage signal vector with respect to the current signal vector Note 1: The reactive power and energy are defined for fundamental frequency only. Note 2: The algorithm used for the calculation of reactive power is not specified, however the meter is expected to meet requirements of GB/T 17215.323 or GB/T 17215.324. 3.1.17 reactive energy the integral of the reactive power as defined in 3.1.16 for a single-phase circuit; the algebraic sum of reactive power and electric energy of each phase for polyphase circuit 3.1.18 operator service person responsible for operation and maintenance of metering equipment and, when applicable, the provision of necessary safety related information to the user [IEC 62052-31:2015, Definition 3.5.22] 3.1.19 nominal value value of a quantity used to designate and identify a component, device, equipment, or system Note: The nominal value is generally a rounded value. [GB/T 2900.83-2008, Definition 151-16-09] 3.1.20 reference value specified value of one influence quantity considered in the reference conditions 3.1.21 service type number of phases and the number of wires for which the meter is suitable (for example, single-phase two-wire, three-phase three-wire, three-phase four-wire) 3.1.22 meter connection mode meter terminal wiring arrangement and configuration of the meter’s metrological relevant embedded software (firmware) parameters applicable to the measured service type 3.1.23 bi-directional (energy) flow ability of a meter to measure energy flow in two directions (positive and negative) [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.34] 3.1.24 positive-direction only (energy) flow ability of a meter to measure energy flow in only one direction (positive) [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.35] 3.1.25 uni-directional (energy) flow ability of a meter to measure the energy flow regardless of the direction of the energy flow [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.36] 3.1.26 positive (energy) flow energy flow direction towards users [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.37] 3.1.27 negative (energy) flow direction of energy flow opposite to positive energy flow for bidirectional meter and uni-directional meter Note: The direction opposite to the positive (energy) flow is called the negative (energy) flow (see 3.1.28). [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.38] 3.1.28 reverse (energy) flow direction of energy flow opposite to positive energy flow for positive-directional energy meter [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.39] 3.2 Definitions related to the functional elements 3.2.1 measuring element part of the meter which produces an output proportional to the energy 3.2.2 test output output used for testing the meter Note: A test output may be an optical pulse output, an electrical pulse output or a communication interface. 3.2.3 operation indicator device which gives a visible signal of the operation of the meter Note: It is modified from GB/T 2900.90-2012, Definition 314-07-13. 3.2.4 pulse wave that departs from an initial level for a limited duration of time and ultimately returns to the original level 3.2.5 pulse output output for emitting pulses 3.2.6 optical test output optical pulse output used for testing the meter 3.2.7 receiving (or scanning) head functional element for receiving the transmitted pulse from the optical pulse output 3.2.8 pulse input pulse input for receiving pulses 3.2.9 memory element which stores digital information 3.2.10 non-volatile memory memory which can retain information in the absence of power 3.2.11 indicating display device that displays the measurement results Note 1: An indicating display may also be used to display other relevant information. Note 2: It is modified from OIML R 46-1/-2: Edition 2012 (E), Definition 2.1.12. 3.2.12 integrated indicating display indicating display integrated in the meter case   3.2.13 detached indicating display indicating display housed in its own enclosure (case) separate from the meter case, powered by the meter Note: A detached indicating display is not a stand-alone generic human machine interface device such as a tablet, a laptop, or a general purpose industrial HMI device The detached indicating display is powered by the meter and specified for use only with (a) designated meter type(s). 3.2.14 register electromechanical or electronic device which stores and displays the information representing the measured energy Note: In static meters, the register comprises both memory and display. 3.2.15 current circuit internal connections of the meter and part of the measuring element through which flows the current of the measured electrical circuit to which the meter is connected Note: For transformer operated meters, "the measured electrical circuit to which the meter is connected” is the secondary winding of the external current transformer(s). 3.2.16 voltage circuit internal connections of the meter and part of the measuring element, and in some cases, part of the meter’s power supply, energized with the voltage of the measured electrical circuit to which the meter is connected 3.2.17 auxiliary supply electrical power supply source, other than the measured electrical circuit, energizing the meter’s internal auxiliary (or standby) power supply circuit via dedicated terminals Note: Auxiliary power supply may be necessary if the voltage circuits become de-energized, but some functions of the meter are expected to operate. Such applications are common with transformer operated meters in substations. 3.2.18 (meter's) auxiliary power supply circuit internal connections of the meter, separate from the voltage circuits, energized from separate auxiliary supply via dedicated terminals 3.2.19 auxiliary device device intended to perform a particular function in addition to the energy measurement functions Note 1: Some examples include but are not limited to: communication module, load control switch, pulse input/pulse output. Note 2: An auxiliary device may be internal or external to a meter. 3.2.20 auxiliary circuit circuit other than the voltage circuits, current circuits or the auxiliary power supply circuit, intended to be connected to (an) external device(s) 3.2.21 mains electrical network supplying the premises 3.2.22 mains-circuit electrical circuit which is conductively connected to and energized directly from the mains Note: Voltage circuits intended to be connected to the secondary side of measuring voltage transformers are classed also as mains circuits. 3.2.23 non-mains-circuit electrical circuit not energized directly from the mains Note 1: This circuit may be isolated by a transformer or supplied by a battery. Note 2: The terms "primary circuit" and "secondary circuit" are used in IEC 61010-1: 2010, while the terms "mains circuit" and "non-mains circuit’ are used in this part, in order to avoid confusion with primary and secondary circuits of instrument transformers used with transformer operated meters. 3.2.24 sub-assembly part of a device having its own recognizable function [OIML R 46-1/-2: Edition 2012 (E), Definition 2.1.20]   3.2.25 primary function any function of an instrument that is considered necessary for the user or most users and needs to be monitored directly or indirectly during tests against external influences Note: Instruments may have multiple basic functions. In addition to measuring electrical energy, the basic function of the instrument may also include the normal operation of other functional elements. For example, the action, time and display of supply control switch and load control switch. 3.3 Definitions of meter ports 3.3.1 port any particular interface of the specific device or system Note: It is modified from GB/T 18268.1-2010, Definition 3.2. 3.3.2 mains port terminals of current and voltage circuits, including the neutral voltage terminal, of directly connected meters, and terminals of voltage circuits of transformer operated meters 3.3.3 current transformer port terminals of current circuits of transformer operated meters 3.3.4 auxiliary power supply port terminals of auxiliary power supply circuits (of the meter) Note: The auxiliary power supply circuit (of the meter) can be a mains or non-mains circuit. 3.3.5 HLV signal port terminals of auxiliary input or output circuits and other non-mains auxiliary circuits rated for voltages considered to be hazardous live Note: For the purposes of this part, signal values that comply with 6.3.2 of IEC 62052-31: 2015 are considered to be hazardous live. For example, power line communication (PLC) terminals, tariff (rate) control inputs, control outputs.   3.3.6 ELV signal port terminals of auxiliary input or output circuits, data communication circuits and other auxiliary circuits rated for voltages that are not considered hazardous live Note: For the purposes of this part, the ELV (Extra Low Voltage) values are specified in IEC 62052-31: 2015, 6.3; this definition includes PELV and SELV circuits. 3.3.7 functional earthing terminal terminal in equipment for purposes of functional earthing Note: See Table E.11 in Annex E for symbols for identifying functional earthing terminals. 3.4 Definitions of mechanical elements 3.4.1 indoor (meter) meter intended for operation under normal climatic conditions in a building or in a meter cabinet Note: Indoor meters are suitable for places with environmental grades H1 and H2. 3.4.2 outdoor (meter) meter intended for operation under extended climatic conditions Note: Outdoor meters are suitable for places with environmental grade H3. 3.4.3 indoor (detached indicating display) detached indicating display intended for operation under normal climatic conditions in a building or in a meter cabinet Note: Indoor detached indicating display is suitable for places with environmental grades H1 and H2. 3.4.4 outdoor (detached indicating display) detached indicating display intended for operation under extended climatic conditions Note: Outdoor (detached indicating display) is suitable for places with environmental grade H3.   3.4.5 meter base back of the meter Note: It is generally fixed and is attached to the measuring elements, the terminals or the terminal block, and the cover; for a flush-mounted meter, the meter base may include the sides of the case. 3.4.6 specified matching (meter) socket base with jaws, test block style connectors, or other type of detachable connectors intended for installation of socket-mounted metering equipment Note 1: This includes terminals for connection to the supply and load circuits; also appropriate secure fixing and sealing arrangements. Note 2: It may be a single-position socket for one meter or a multiple-position socket for two or more meters. Note 3: This term only relates to metering equipment designed as a socket-mounted unit. Note 4: Metering equipment can meet the relevant type testing requirements when it is properly installed in any specified matching socket. 3.4.7 cover of meter enclosure on the front of the meter Note: The cover is made either wholly of transparent material or opaque material provided with window(s) through which the operation indicator and the indicating display can be read. 3.4.8 case of meter comprises the base and the cover Note: When the case is closed, it provides protection against certain external influences and, in any direction, and protection against direct contact and spread of fire. 3.4.9 terminal block support made of insulating material on which all or some of the terminals of the meter are grouped together Note: It is modified from GB/T 2900.90-2012, Definition 314-07-18. 3.4.10 terminal cover of meter cover which conceals meter terminals or terminals of detached indicating display, and, the ends of the external wires or cables connected to the terminals Note: When the meter is mounted in its normal working position and when the terminal cover is in place, it provides protection in any direction against direct contact with the meter terminals. 3.4.11 sealing means intended to protect the meter against, and provide evidence of, any unauthorized modification, readjustment, removal of parts, embedded software (firmware), etc. Note: Sealing can be achieved by hardware, embedded software (firmware) or a combination of both. 3.4.12 metrology seal specific securing measure which can be applied to an electricity meter to ensure its metrological integrity 3.4.13 installation seal specific securing measure which can be applied by an installer to ensure the integrity of the meter installation 3.4.14 equipment device with functions related to electrical energy measurement and control Note: Some examples include but are not limited to: electricity meters, payment meters, tariff and load control equipment. The term "meter" is used in the text sometimes as a synonym of "metering equipment". A meter may include other functions, in addition to the basic energy metering function. 3.4.15 permanently connected equipment equipment that is electrically connected to a supply by means of a permanent connection which can be detached only using a tool 3.4.16 tool external device, including keys and coins, used to aid a person to perform a mechanical function   3.4.17 terminal conductive part of a device, electric circuit or electric network, provided for connecting that device, electric circuit or electric network to one or more external conductors 3.4.18 meter cabinet enclosure for housing metering equipment and affording protection suitable for the intended application Note: It may be fixed on a wall, built in a wall recess or it may be free-standing and self-supporting. It may also accommodate elements of the electrical installation, such as fuses, circuit breakers, or residual current devices. 3.4.19 packaging products used for the containment, protection, handling, delivery and preservation of the meter from the manufacturer to the user or consumer 3.5 Definitions related to measurements 3.5.1 starting current ISt the minimum value of current at which the meter is required to start and continue to register active electrical energy at cos(φ) = 1 (and in case of polyphase meters, with balanced load) Note 1: The terms “voltage” and “current” indicate RMS values unless otherwise specified. Note 2: It is modified from OIML R 46-11-2: Edition 2012 (E), Definition 2.2.2. 3.5.2 minimum current Imin lowest current at which the meter accuracy requirements are specified Note 1: The terms “voltage” and “current” indicate RMS values unless otherwise specified. Note 2: It is modified from OMIL R 46-1/2: Edition 2012 (E), Definition 2.2.3.   3.5.3 transitional current Itr specified current value. When it is greater than or equal to this value, the maximum permissible error corresponding to the accuracy level of the instrument is within the minimum limit Note 1: The terms “voltage” and “current” indicate RMS values unless otherwise specified. Note 2: It is modified from OMIL R 46-1/2: Edition 2012 (E), Definition 2.2.4. 3.5.4 maximum current Imax highest current that the meter can carry continuously and remain safe, and at which it purports to meet the accuracy requirements Note 1: The terms “voltage” and “current” indicate RMS values unless otherwise specified. Note 2: It is modified from OMIL R 46-1/2: Edition 2012 (E), Definition 2.2.5. 3.5.5 nominal voltage Unom voltage in accordance with which the relevant performance of the meter is fixed Note: The terms “voltage” and “current” indicate RMS values unless otherwise specified. 3.5.6 nominal frequency fnom frequency in accordance with which the relevant performance of the meter is fixed 3.5.7 specified measuring range set of values of a measured quantity for which the error of a meter is intended to lie within specified limits 3.5.8 accuracy quality which characterizes the ability of a measuring instrument (meter) to provide an indicated value close to a true value to be measured Note: It is modified from GB/T 2900.77-2008, Definition 311-06-08. 3.5.9 accuracy class category of measuring instrument and system, all of which are intended to make the measurement error or measurement uncertainty of the instrument within the specified limit and meet the specified measurement requirements under the specified operating conditions Note: The measurement requirements specified in the accuracy class include the permissible deviation from the reference value. [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.28]. 3.5.10 percentage error percentage error is given by the following formula: (1) where, ——the percentage error; —— the energy registered by the meter; ——the true energy. Note: Since the true value cannot be determined, it is approximated by a value with a stated uncertainty that can be traced to (reference) standard meters subject to an agreement between the manufacturer and the purchaser or to national standards. 3.5.11 repeatability difference between consecutive measured results under the same measurement conditions Note 1: The measurement conditions are called “repeatability conditions”. Note 2: The repeatability conditions include: ——by the same measurement procedure; ——by the same observer; ——with the same measuring instrument under the same conditions; ——in the same place; ——at relatively short intervals of time. Note 3: It is modified from GB/T 2900.77-2008, Definition 311-06-06. 3.5.12 intrinsic error instrument error measured under reference conditions [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.21] 3.5.13 initial intrinsic error intrinsic error of the instrument measured before the performance test and durability test. [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.22] 3.5.14 base maximum permissible error limit value of the error indicated by the measuring instrument, except that the current and power factor (or sin φ) vary within the range given by the rated operating conditions and the instrument operates under the reference conditions Note: It is modified from OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.19. 3.5.15 maximum permissible error shift limit value of the permissible deviation of the error indicated by the measuring instrument when the single influence quantity takes the value under the reference condition and varies under the rated operating condition Note 1: Each influence quantity has a corresponding maximum permissible error shift. Note 2: Maximum permissible error is the combination of basic maximum permissible error and maximum permissible error shift. Note 3: It is modified from OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.20. 3.5.16 maximum permissible error limit value of measurement error allowed for a given measurement, measuring instrument or metering system for a given reference value Note 1: Generally, the terms "maximum permissible error" or "error limit" are used in cases where there are two limit values. Note 2: The term "tolerance" should not be used to mean "maximum permissible error". Note 3: Maximum permissible error is the combination of basic maximum permissible error and maximum permissible error shift. Note 4: It is modified from OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.18. 3.5.17 uncertainty (of measurement) parameter, associated with the result of a measurement, that characterizes the relative dispersion of the values, expressed as a percentage, that could reasonably be attributed to the measurand Note 1: The parameter can be, for example, a standard deviation (or a given multiple of it), or a half width of an interval having a stated level of confidence. Various ways of obtaining uncertainty are defined in GUM standards. Note 2: Uncertainty of measurement comprises, in general, many components. Some of these components can be evaluated from the statistical distribution of the results of a series of measurements and can be characterized by experimental standard deviations. The other components, which can also be characterized by standard deviations, are evaluated from the assumed probability distributions based on experience or other information. 3.5.18 durability (of accuracy) ability of a meter to perform energy measurement functions until the end of its useful life, abbreviated as "durability" [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.29]   3.6 Definitions related to external influences 3.6.1 influence quantity any quantity of long duration which is not subject of the measurement and whose change affects the metrological function or performance of the meter Note 1: For the purpose of this part, the term "meter" means a meter with its detached indicating display, if specified. Note 2: It is modified from GB/T 2900.77-2008, Definition 311-06-01. 3.6.2 disturbance any quantity of short (transient) duration, which may affect the metrological performance of the meter 3.6.3 critical change value minimum amount of change allowed in the meter's energy registers during disturbance tests without any current flowing in the meter's current circuits, which is derived from the following formula: (2) where, x——the critical change value, [kWh (or kVAh)]; m——the number of measuring elements; Unom——the nominal voltage, V; Imax——the maximum current, A; 3.6.4 reference conditions appropriate set of influence quantities and performance characteristics with reference values, their tolerances and ranges, with respect to which the intrinsic error is specified Note: It is modified from GB/T 2900.77-2008, Definition 311-06-02.   3.6.5 shift of error due to an influence quantity difference between the percentage errors of the meter when only one influence quantity assumes successively two specified values, one of them being the reference value 3.6.6 distortion factor d ratio of the RMS value of the distortion content to the RMS value of an alternating quantity Note 1: The distortion content can be obtained by subtracting its fundamental wave from the non-sinusoidal quantity. Note 2: Distortion factor is generally expressed as a percentage. It is equal to total harmonic distortion. [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.13] 3.6.7 reference temperature ambient temperature specified for reference conditions 3.6.8 mean temperature coefficient ratio of the variation of the percentage error to the change of temperature which produces this variation 3.6.9 rated operating condition set of specified measuring ranges for performance characteristics and specified operating ranges for influence quantities Note: Within this set, the variations of operating percentage errors of a meter are specified and determined 3.6.10 specified operating range range of values of a single influence quantity which forms a part of the rated operating conditions 3.6.11 limit range of operating extreme conditions which an operating meter can withstand without damage and without degradation of its metrological characteristics when it is subsequently operated under its rated operating conditions Note: A relaxed accuracy requirements may be specified in this range. 3.6.12 storage and transport condition extreme conditions which a non-operating meter can withstand without damage and without degradation of its metrological characteristics when it is subsequently operated under its rated operating conditions 3.6.13 normal working positions position of the meter defined by the manufacturer for normal service 3.6.14 thermal stability thermal stability is reached when the change in percentage error as a consequence of thermal effects during 20 min is less than 0.1 times the intrinsic error limit 3.6.15 normal use operations performed according to the instructions for use or instructions for obvious intended use, including standby [IEC 62052-31: 2015, Definition 3.5.14] 3.6.16 interharmonic (frequency) harmonics whose frequency is a non-integer multiple of the reference fundamental frequency [IEC 60050-551-20: 2001/Amd. 1: 2017, 551-20-06] Note: By extension from harmonic order, the interharmonic order is the ratio of an interharmonic frequency to the fundamental frequency. This ratio is not an integer. (Recommended notation m). 3.7 Definition of tests 3.7.1 type tests procedure according to which the series of tests is carried out on one meter or on a small number of meters of the same type having identical characteristics, to verify that the respective type of meter complies with all the requirements of this part and relevant accuracy class standards   3.8 Definitions related to electromechanical meters 3.8.1 rotor moving element of the meter upon which the magnetic fluxes of fixed windings and of braking elements act and which operates the register 3.8.2 driving element working part of the meter which produces a torque by the action of its magnetic fluxes on the currents induced in the moving element Note: It generally comprises electromagnets and their control devices, and is fixed on the frame, and its characteristic parameters include but are not limited to basic torque. 3.8.3 braking element part of the meter which produces a braking torque by the action of its magnetic flux on the currents induced in the moving element Note: It generally comprises one or more magnets and their adjusting devices 3.8.4 frame part to which are affixed the driving elements, the rotor bearings and the register Note: Usually, the frame also fixes the braking element, and sometimes the adjusting devices. 3.8.5 basic speed nominal speed of rotor rotation, expressed in revolutions per minute, under reference conditions, when a current of 10Itr is applied and the power factor (or sin φ) is 1 3.8.6 basic torque nominal value of the torque, applied to the rotor to keep it from moving, under reference conditions, when a current of 10Itr is applied and the power factor (or sin φ) is 1 3.8.7 vertical working position position of the meter in which the shaft of the rotor is vertical   3.9 Definitions related to meter marking and symbols 3.9.1 excess energy meter instrument for measuring excess electrical energy when the power exceeds a predetermined value [GB/T 2900.79-2008, Definition 313-06-07] 3.9.2 meter with maximum demand indicator instrument equipped with a device indicating the maximum average power value in successive equal time intervals Note: It is modified from GB/T 2900.79-2008, Definition 313-06-08. 3.9.3 primary register register of an instrument transformer-operated meter which takes into account the ratios of all the transformers (voltage and current transformers) to which the meter is connected Note 1: The value of the energy on the primary side of the transformers is obtainable from the direct reading of the register. Note 2: It is modified from GB/T 17215.352-2009, Definition 3.4. 3.9.4 half-primary register register of an instrument transformer-operated meter which takes into account either the ratio(s)of the current transformer(s) or the ratio(s) of the voltage transformer(s), but not both Note 1: The value of the energy on the primary side of the transformer(s) is obtainable from the reading of the register multiplied by an appropriate factor. Note 2: It is modified from GB/T 17215.352-2009, Definition 3.5. 3.9.5 secondary register register of an instrument transformer-operated meter which does not take into account the transformer ratio(s) Note 1: The value of the energy on the primary side of the transformer(s) is obtainable from the reading of the register multiplied by an appropriate factor. Note 2: It is modified from GB/T 17215.352-2009, Definition 3.6. 3.9.6 nameplate information information for the identification and installation of the meter and for the interpretation of the measurement results Note 1: Nameplate data may be carried by a nameplate placed inside or outside of the meter case or may be printed on the meter case. Note 2: For static meters, some nameplate data may be shown on the display. 3.9.7 dial part of the indicating device carrying the scale or scales Note 1: In general, the dial also carries other information characterizing the instrument. Note 2: It is modified from GB/T 2900.90-2012, Definition 314-01-03. 3.9.8 constant (for meter) for electromechanical meter, it refers to the value expressing the relation between the energy registered by the meter and the corresponding number of revolutions of the rotor Note 1: For example, for electromechanical meters, the active constant is expressed in either revolutions per kilowatt hour (r/kWh) or watt hours per revolution (Wh/r). for static meters, it refers to the value expressing the relation between the energy registered by the meter and the corresponding value of the test output Note 2: For example, for static meters, if the test output value is the number of pulses, the active constant is expressed in either impulses per kilowatt-hour (imp/kWh) or watt-hours (Wh/imp) per impulse. 3.10 Definitions related to faults 3.10.1 fault difference between the indication error of the instrument and the intrinsic error of the instrument Note 1: In principle, faults refer to the result that the data stored or transmitted by the meter is not desired to be changed. Note 2: By definition, "fault" is a numerical value expressed in units of measurement or relative values (such as percentages). [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.30] 3.10.2 significant fault fault exceeding the applicable limit Note: The following cases should also be regarded as significant fault: ——The change value of the energy register due to disturbance is greater than its critical change value; ——The function of the instrument is damaged. [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.31] 3.10.3 checking facility function integrated in the instrument and can check and deal with significant fault Note 1: "Deal with" refers to any appropriate response made by the instrument (optical signal, sound signal, stop of measurement process, etc.). Note 2: The actions after significant faults are detected should be: or stop measurement and record the time and duration of stopping measurement, or record the time and duration of faults and the accumulated electric energy during fault. Note 3: It is modified from OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.31. 3.11 Definitions related to metrological performance protection 3.11.1 legally relevant attribute of a part of an instrument, device, or software that is subject to legal control [OIML R 46-1/-2: Edition 2012 (E), Definition 2.2.40] 3.11.2 device-specific parameter parameter based on a single device or measuring instrument Note 1: Device-specific parameters include adjustable parameters (e.g. sensitivity or other modified parameters) and configuration parameters (e.g. measurement range, scale interval, units of measurement), which are usually adjustable or optional only under special operation modes of the instrument. It may be divided into unchangeable parameters and parameters that can be set by authorized users. Note 2: It is modified from JJF 1182-2007, 3.19. 3.11.3 data domain parameter, variable and stack used to save data in programs Note 1: The data domain may belong to one or several software modules. Note 2: It is modified from JIF 1182-2007, 3.14. 3.11.4 interface connecting parts of measuring instruments Note 1: Interfaces allow communication between measuring instruments, their components, and software modules. Note 2: It is modified from JJF 1182-2007, 3.15. 3.11.5 software interface it is composed of program code and proprietary data domain, which receives, filters and transmits data between legally relevant parts and software modules. Note: If there are parts of the software other than legally relevant, they can be communicated through the software interface and can be separated in a sense. The communication software part exchanges data through variables (or files) that can be fully accessed (read or written). These interface variables and the program code for writing data to and reading data from the interface variables constitute a software interface (these interface variables conform to the circuit of the hardware interface). Interface variables can be implemented by, for example, full program variables, functional parameters, or data files. [JJF 1182-2007, Definition 3.17] 3.11.6 user interface interface between users and measuring instruments, hardware and software information of measuring instruments Note 1: For example: switches, keyboards, mice, displays, printers, touch screens, on-screen software windows, and software that generates windows. Note 2: It is modified from JJF 1182-2007, 3.18. 3.11.7 software separation the legally relevant software and the non-legally relevant software in the measuring instruments are relatively independent, and can communicate through the software interface Note: It is modified from JJF 1182-2007, Definition 3.31. 4 Nominal electrical values 4.1 Voltages 4.1.1 Nominal voltages The nominal voltage(s) of a meter shall be equal to one or more of the nominal voltages listed in Table 1. Table 1 Nominal voltages In: V Meters Nominal values Exception values Direct connected meter 220, 380 100, 110, 120, 208, 230, 240, 277, 347, 400, 415, 480, 600, 660, 690 Connection through voltage transformer(s) 57.7, 100 63.5, 110, 115, 120, 200, 220, 230 4.2.1 Voltage ranges The voltage ranges of a meter shall be at least equal to the voltage ranges listed in Table 2. Table 2 Voltage ranges Operating range Voltage range Specified operating range 0.9Unom to 1.1Unom Limit range of operation 0 to 1.15Unom a a The maximum voltages under earth-fault conditions are specified in 9.4.1; these voltages are considered as fault conditions (not normal operating conditions).   4.2 Currents 4.2.1 Transitional currents The transitional current(s) of a meter shall be equal to one or more of the nominal transitional current values listed in Table 3. Table 3 Nominal transitional currents In: A Meters Nominal values Exception values Direct connected meter 0.1, 0.125, 0.2, 0.25, 0.5, 1, 2, 3 0.75, 1.5, 2.5, 4.5 Connection through current transformer(s) 0.015, 0.05, 0.075, 0.1, 0.25 0.125 4.2.2 Starting current The ratio of the maximum current of the meter to the starting current (Imax/Ist) shall meet those specified in Table 4. Table 4 Requirements for starting current Meters Accuracy of meters A B C D E Direct connected meter Imax/Ist ≥ 1,000 Imax/Ist ≥ 1,250 Imax/Ist ≥ 1,250 Imax/Ist ≥ 1,250 Imax/Ist ≥ 1,250 Connection through current transformer(s) Imax/Ist ≥ 600 Imax/Ist ≥ 1,200 Imax/Ist ≥ 1,200 Imax/Ist ≥ 1,200 Imax/Ist ≥ 1,200 4.2.3 Minimum current The ratio of the maximum current of the meter to the minimum current (Imax/Imin) shall meet those specified in Table 5. Table 5 Requirements for minimum current Meters Accuracy of meters A B C D E Direct connected meter Imax/Ist ≥ 100 Imax/Ist ≥ 125 Imax/Ist ≥ 250 Imax/Ist ≥ 250 Imax/Ist ≥ 250 Connection through current transformer(s) Imax/Ist ≥ 60 Imax/Ist ≥ 120 a Imax/Ist ≥ 120 Imax/Ist ≥ 120 Imax/Ist ≥ 120 a For electromechanical meters with accuracy of Class B, Imax/Imin ≥ 60. 4.2.4 Maximum current The maximum current(s) of a meter shall be equal to one or more of the current values listed in Table 6. The maximum current (Imax) for directly connected meters should be an integral multiple of the transitional current, and shall meet Imax/Itr ≥ 50. When the meter is operated from (a) current transformer(s), attention is drawn to the need to match the current range of the meter in relation to that of the secondary of the current transformer(s). The maximum current should be an integral multiple of the transitional current, and shall meet Imax/Itr ≥ 24. Table 6 Maximum currents In: A Meters Nominal values Exception values Direct connected meter 10, 20, 40, 60, 80, 100, 120 1.2, 2, 6, 30, 50, 160, 200, 320 Connection through current transformer(s) 1.2, 2, 6, 10 1.5, 2.4, 3, 3.75, 4, 5, 7.5, 9, 20 4.3 Frequencies 4.3.1 Nominal frequencies The nominal frequencies for meters (fnom) shall be equal to 50 Hz or 60 Hz. 4.3.2 Frequency ranges The frequency range(s) of meters are listed in Table 7. Table 7 Frequency ranges Frequency range Frequency range (fnom = 50 Hz) Frequency range (fnom = 60 Hz) Specified operating range (fnom ± 2%) 49.0 Hz to 51.0 Hz 58.8Hz to 61.2Hz Other frequency ranges Extended frequency ranges are subject to an agreement between the manufacturer and the purchaser. 4.4 Power consumption The power consumption of a meter shall be determined at reference conditions given in 7.1 by any suitable method. The maximum uncertainty of the measurement of the power consumption shall not exceed 5% of the value specified in Table 8. The active and apparent power consumption for each voltage and current circuit measured at 10Itr current condition shall not exceed the values shown in Table 8. In case of meters specified for multiple values of nominal frequency, nominal voltage or transitional current, the measurements shall be conducted using nominal values resulting in the worst case (highest) power consumption of the meter. If the meter has other auxiliary devices besides power measurement function, test the power consumption when the auxiliary devices are under non-operated state, for example: ——auxiliary devices for external communication (such as GPRS, CDMA, LTE, PLC, micro-power wireless, etc.); ——independent rate and load control equipment (e.g., power control switch, load control switch, etc.); ——input-output module (e.g., pulse input, control output, etc.) or other accessories (e.g., LCD indicator backlight, etc.). Table 8 Power consumption Meter circuit Single-phase Two-phase per phase a Three-phase per phase a The meter is powered by voltage circuit Voltage circuit 2W, 10 VA 2W, 10 VA 2W, 10 VA Voltage circuit for multi-function meter 5W, 25 VA 3.5W, 17.5 VA 3W, 15 VA (Meter's) auxiliary power supply circuit The common values are 2W, 10 VA, and other values may be negotiated between the manufacturer and the purchaser The meter is powered by an auxiliary power supply circuit Voltage circuit The general value is 0.5 VA per phase, and other values may be negotiated between the manufacturer and the purchaser Current circuit of electromechanical meter Class A: 2.5 VA per phase; Class B: 4 VA per phase; Class C: 6 VA per phase Current circuit for static meter For all classes: 1 VA per phase. Note 1: In order to match voltage and current transformers to meters, the meter manufacturer shall state whether the burden is inductive or capacitive (for transformer operated meters only). Note 2: The figures in this table are mean values. Switching power supplies with peak power values higher than these specified values are permitted, but it is advisable to ensure that the rating of the associated voltage transformer is sufficient. a For polyphase meters, power consumption is expected to be evenly distributed between two-phase or three-phase supply. Should a phase voltage be missing, it is permitted that the maximum consumption per phase is higher than specified but in no case shall exceed three times the allowed limit for individual phase. However, the meter shall continue to operate correctly.   5 Construction requirements 5.1 General All parts which are subject to corrosion under normal operating conditions shall be protected effectively. Any protective coating shall not be liable to damage by ordinary handling nor damage due to exposure to air, under normal operating conditions. Outdoor meters shall withstand sunlight radiation. The meter case shall be so constructed and arranged that any non-permanent deformation cannot prevent the satisfactory operation of the meter. In case of meters with detached indicating displays, this requirement applies also to the enclosure of the detached indicating display. The meter cover shall not be removable without the use of a tool. If an electricity meter is designed to be installed in a specified matching socket or a rack, then the mechanical requirements apply to, and the mechanical tests shall be performed on, the meter installed in its specified matching socket or rack, as per the manufacturer’s instructions. Note: For meters for special use in corrosive atmospheres, additional mechanical requirements are subject to an agreement between the manufacturer and the purchaser (for example salt mist test according to GB/T 2423.17). Except for the specified test methods, the structural requirements in 5.3 to 5.9 below shall be verified by visual inspection or according to the documents provided by the supplier. 5.2 Mechanical tests 5.2.1 Shock test Before the test, the intrinsic error of the meter shall be measured under the reference condition according to 7.1. The test shall be carried out according to GB/T 2423.5, under the following conditions: ——meter in non-operating condition, without the packing; ——half-sine pulse; ——peak acceleration: 30 g (300 m/s2); ——duration of the pulse: 18 ms. After the test, the meter function shall not be damaged and shall operate correctly according to the relevant requirements of GB/T 17215.3 (all parts). The error offset at 10Itr and under the power factor (or sinφ) of 1 shall meet the error shift limit for meters with all accuracy classes specified in GB/T 17215.3 (all parts). 5.2.2 Vibration test Before the test, the intrinsic error of the meter shall be measured under the reference condition according to 7.1. The test shall be carried out according to GB/T 2423.43 and GB/T 2423.56, under the following conditions: ——meter in non-operating condition, without the packing; ——the meter shall be tested in three perpendicular axes to each other in turn. ——frequency range: 10 Hz to 150 Hz; ——level of intensity;  Total RMS level: 7m/s2;  Acceleration spectral density (ASD) level (10 Hz to 20 Hz): 1m2/s3;  Acceleration spectral density (ASD) level (20 Hz to 150 Hz): –3dB/octave. ——duration on each axis: at least 2 min. After the test, the meter function shall not be damaged and shall operate correctly according to the relevant requirements of GB/T 17215.3 (all parts). The error offset at 10 Itr and under the power factor (or sinφ) of 1 shall meet the error shift limit for meters with all accuracy classes specified in GB/T 17215.3 (all parts). 5.3 Window If the cover is not transparent, one or more windows shall be provided for reading the indicating display and observation of the operation indicator. These windows shall be of transparent material which cannot be removed undamaged without breaking the seal(s). This requirement also applies to detached indicating displays. 5.4 Sealing provisions 5.4.1 General The meter shall be designed in a way that allows sealing of the meter case, the detached indicating display, terminal cover of meter and the relevant metrological configuration parameters. When the meter has been installed according to the installation instructions, regardless of the solution used to implement sealing, it shall be visually evident if the sealing has been tampered with. 5.4.2 Meter case The meter case shall have a means for applying a metrology seal in such a way that the internal parts of the meter are accessible only after breaking the sealing mechanism. 5.4.3 Sealing of terminal covers If the terminal of meter, as a permanent connection equipment, is not protected by any other means, a sealable terminal cover independent of the meter case shall be provided to prevent tampering with. The terminal cover shall have a position for sealing with the installation seal. This requirement applies to the terminal cover(s) for the terminals of current and voltage measuring circuits, and the terminals of auxiliary power supply circuits. Note: Additional seals may be required for other terminals (such as separate display terminals). The terminal cover shall enclose the meter terminals, the conductor fixing screws and, a suitable length of the external conductors and their insulation. No conductive material shall be exposed when the terminal cover is installed. 5.4.4 Sealing of detached indicating displays The enclosure (case) of a detached indicating display shall have means for applying a metrology seal in such a way that the internal parts of the detached indicating display are accessible only after breaking the sealing mechanism. The connection terminals of the detached indicating display cable, both at the meter and at the detached indicating display, shall have means for being sealed with an installation seal. 5.4.5 Sealing of meter configuration The meter and its detached indicating display, if present, shall have means for securing of all metrologically relevant parameters by means of (a) metrology seal(s). The securing means may comprise a hardware seal capable of providing sufficient evidence of unauthorized intervention, or an embedded software (firmware) cryptographic seal, or both. (See 10.3, 10.4). 5.5 Display of measured values 5.5.1 General These requirements are applicable to meters with integrated indicating display or detached indicating display. The meter shall have one (or more) indicating displays which shall be capable of indicating or displaying the value of each legal unit measured by the certified meter. The indicating display shall be easy to read, and the height of characters displaying measurement results shall be at least 4 mm. Under normal operating conditions, the maximum service life of the meters shall not be exceeded, and the indicating display shall not be seriously affected. The measurement results shall be displayed continuously or on demand on its integrated indicating display or detached indicating display. When the meter is not powered on, the electronic indicating display shall not to display. The principal unit for the measured values shall be the watt-hour (Wh), var-hour (varh), volt-ampere-hour (VAh), kilowatt-hour (kWh), kilovar-ho

Foreword i Introduction ii 1 Scope 2 Normative references 3 Terms and definitions 3.1 General definitions 3.2 Definitions related to the functional elements 3.3 Definitions of meter ports 3.4 Definitions of mechanical elements 3.5 Definitions related to measurements 3.6 Definitions related to external influences 3.7 Definition of tests 3.8 Definitions related to electromechanical meters 3.9 Definitions related to meter marking and symbols 3.10 Definitions related to faults 3.11 Definitions related to metrological performance protection 4 Nominal electrical values 4.1 Voltages 4.2 Currents 4.3 Frequencies 4.4 Power consumption 5 Construction requirements 5.1 General 5.2 Mechanical tests 5.3 Window 5.4 Sealing provisions 5.5 Display of measured values 5.6 Storage of measured values 5.7 Outputs 5.8 Electrical pulse inputs 5.9 Operation indicator 6 Meter marking and documentation 6.1 Meter accuracy class marking 6.2 Nameplate 6.3 Connection diagrams and terminal marking 6.4 Symbols 6.5 Documentation 7 Metrological performances 7.1 General conditions for tests 7.2 Methods of accuracy verification 7.3 Meter constant test 7.4 Test of no-load condition (false actuation) 7.5 Starting current test 7.6 Measurement test of initial intrinsic error 7.7 Repeatability test 7.8 Variation requirement test 7.9 Variation test of load current rise and fall 7.10 Error consistency test 7.11 Limits of error due to influence quantities 7.12 Combined error test of energy indication 7.13 Timing accuracy test 7.14 Test of combined maximum permissible error 8 Climatic environment 8.1 General requirements 8.2 Temperature range and environmental class 8.3 Other climatic conditions 8.4 Test of the effects of the climatic environments 9 External influence 9.1 General requirements 9.2 Acceptance criteria 9.3 Electromagnetic compatibility (EMC) test 9.4 Test of immunity to other influence quantities 10 Metrological property protection 10.1 General 10.2 Embedded software (firmware) identification 10.3 Software protection 10.4 Parameter protection 10.5 Separation of meter and sub-assembly 10.6 Software separation 10.7 Data storage, data transmission through communication system 10.8 Maintenance and upgrade 10.9 Detection function of event record 10.10 Verification method 11 Type test 11.1 Test conditions 11.2 Type test report Annex A (Informative) Main technical changes between this part and GB/T 17215.211- Annex B (Normative) Optical test output Annex C (Normative) Class A and class B electrical pulses Annex D (Normative) Electrical pulse for special applications and long distances according to GB/T Annex E (Informative) Meter symbols and markings Annex F (Normative) Calculation of combined error Annex G (Informative) Meter ports Annex H (Informative) Test set-up for EMC tests Annex I (Informative) Test for conducted, differential mode current disturbances Annex J (Informative) Ring wave test Annex K (Informative) Electromagnet for testing the influence of externally produced magnetic fields Annex L (Normative) Test circuit diagram for testing harmonic influence in current and voltage circuits Annex M (Informative) Short time overcurrent test waveform Annex N (Informative) Fast load current variation test Annex O (Normative) Test circuit diagram for the test of immunity to earth fault Annex P (Normative) Recommended test sequences Bibliography Figure B.1 Test arrangement for the test output Figure B.2 Waveform of the optical test output Figure C.1 Physical interface of the electrical pulse output Figure C.2 Electrical output pulse waveform Figure C.3 Pulse output test arrangement Figure C.4 Pulse input test arrangement Table C.3 Test of pulse input device Figure D.1 Output pulse waveform Figure D.2 Pulse output test arrangement Figure D.3 Pulse input test arrangement Figure G.1 Typical port configuration of a direct connected meter (example) Figure G.2 Typical port configuration of a transformer operated meter (example) Figure H.1 Test setup for RF electromagnetic field test Figure H.2 Test setup for RF electromagnetic field test with reference meter Figure H.3 Test setup for fast transient burst test: voltage circuit Figure H.4 Test setup for fast transient burst test with reference meter: voltage circuit Figure H.5 Test setup for fast transient burst test: current circuit Figure H.6 Test setup for fast transient burst test with reference meter: current circuit Figure I.1 Test setup for differential mode current disturbance from power electronics and mains communication systems (from IEC 61000-4-19) Figure L.1 Test circuit diagram (influence test of 5th harmonic, interharmonic, higher harmonic, vertex sharp wave and vertex square wave) Figure L.2 Burst fired waveform (2 periods on, 2 periods off) Figure L.3 Informative distribution of harmonic content of burst fired waveform (the Fourier analysis is not complete) Figure L.4 90° phase fired waveform Figure L.5 Informative distribution of harmonic content of 90° phase fired waveform (the Fourier analysis is not complete) Figure L.6 Test circuit diagram for half-wave rectification (DC and even harmonics) Figure L.7 Half-wave rectified waveform (DC and even harmonics) Figure L.8 Informative distribution of harmonic content of half-wave rectified waveform (the Fourier analysis is not complete) Figure L.9 Vertex square waveform current amplitude Figure L.10 Vertex sharp waveform current amplitude Figure O.1 Circuit to simulate earth fault condition in phase U Figure O.2 Voltages at the meter under test Table 1 Nominal voltages Table 2 Voltage ranges Table 3 Nominal transitional currents Table 4 Requirements for starting current Table 5 Requirements for minimum current Table 6 Maximum currents Table 7 Frequency ranges Table 8 Power consumption Table 9 Marking and documentation requirements Table 10 Voltage and current balance Table 11 Reference conditions Table 12 Mandatory test points for measuring initial intrinsic error Table 13 Repeatability test points Table 14 Temperature range Table 15 Environmental limit Table 16 Environmental class Table 17 Other climatic conditions Table 18 Temperature and duration of dry heat test Table 19 Temperature and duration of cold test Table 20 Procedure for solar radiation test Table 21 Acceptance criteria Table 22 AC voltage dips and short interruptions test Table 23 DC voltage dips and short interruptions test Table 24 Evaluation of primary meter functions under influence of voltage variation Table 25 Recommended verification methods for each item Table C.1 Specified operating conditions Table C.2 Test of pulse output Table C.3 Test of pulse input device Table D.1 Specified operating conditions Table D.2 Test of pulse output Table D.3 Test of pulse input device Table E.1 Voltage marking (examples) Table E.2 Symbols indicating the accuracy class and the meter constant test (examples) Table E.3 Symbols for measuring elements Table E.4 Symbols for transformer operated meters (examples) Table E.5 Symbols indicating information marking (examples) Table E.6 Marking of the measured quantity (examples) Table E.7 Principal unit symbols for meters (examples) Table E.8 Symbols for auxiliary devices (examples) Table E.9 Symbols for details of the suspension of the moving element (examples) Table E.10 Symbols for communication ports (examples) Table E.11 Other symbols (examples) Table L.1 Waveform of vertex square wave Table L.2 Waveform of vertex sharp wave Table P.1 Recommended test sequences